the part you need for your car is made by metra electronics and the model number is the GMOS-01. We have it at circuit city for $119.99....But thats only if your going to switch out your factory head unit. The way you can tell if you need this part is you sit in your car with the drivers door open...put the key to the ACC position...if you hear the door chime coming out of the drivers door through the speaker...you need this part....All this part does is integrate your factory door chimes and some vehicle diagnostics...necessary for the install....also you dont have any ACC+ wire behind your radio....hope this helps you out!!!